Australian plants differ from South American ones examined in having papillose rather than regularly serrulate upper leaf margins, similarly papillose calyx-lobes, and usually 4- or 5-merous flowers. Although it has a similar distribution and often grows together with the superficially similar C. decumbens it is readily distinguished by its umbellate terminal cymes as well as its short and almost globose seeds with widely spaced papillae on longitudinal ridges.